A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Non-Community Transient Water Supply
A water supply system that supplies less than 25 people (less than 15 connections) and which is used for a transient populations such as in a roadside café, bed & breakfast or gas station.

Non-Community, Non-Transient Water Supply
A water supply system that supplies less than 25 people (less than 15 connections) and which is used for a "permanent population" such as in a school or condominium unit.

Non-Point Source Pollution
A form of diffuse pollution originating from a wide land area, not from one specific location. Typical forms of NPS pollution result from sediment, nutrients, organic and toxic substances originating from land-use activities, which are carried to lakes and streams by surface runoff. NPS contamination can occur when rainwater, snowmelt, or irrigation washes off fields, paved streets, roofs and suburban yards and picks up soil and dust particles, street dirt or chemicals and pollutants, such as nutrients and pesticides.

NTU (Nephelometric turbidity unit)
The unit of measure for describing the turbidity of water. It is a measure of the cloudiness of water as measured by a nephelometer. Turbidity is based on the amount of light that is reflected off particles in the water. NTUs are typically used as an index for the quality of lake water.

Nutrients
Elements, or compounds, such as carbon, nitrogen, phosphorus that are essential for organism (plants or animals) growth.